Fix key propogation test

Author: Archmonger

tests/test_web/js_fixtures/keys-properly-propagated.js

@@ -1,5 +1,5 @@
-import React from "https://esm.sh/v135/react@19.0"
-import ReactDOM from "https://esm.sh/v135/react-dom@19.0/client"
+import React from "https://esm.sh/v135/react@18.3.1"
+import ReactDOM from "https://esm.sh/v135/react-dom@18.3.1/client"
 import GridLayout from "https://esm.sh/v135/react-grid-layout@1.5.0";
 export {GridLayout};